The SI unit of absorbed dose is:

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Multiple Choice

The SI unit of absorbed dose is:

Explanation:
Absorbed dose measures how much energy from ionizing radiation is deposited in a mass. The SI unit for this quantity is the gray, defined as one joule of energy deposited per kilogram of matter. This unit directly represents energy imparted per unit mass, without accounting for biological effects. Other units are either legacy or incorporate biological weighting. A rad is 0.01 gray, and rem or sievert represent equivalent or effective dose, which include factors to reflect tissue sensitivity and radiation type—so they measure potential biological impact, not the pure energy deposition. Hence, for the absorbed-dose quantity, gray is the correct SI unit.

Absorbed dose measures how much energy from ionizing radiation is deposited in a mass. The SI unit for this quantity is the gray, defined as one joule of energy deposited per kilogram of matter. This unit directly represents energy imparted per unit mass, without accounting for biological effects.

Other units are either legacy or incorporate biological weighting. A rad is 0.01 gray, and rem or sievert represent equivalent or effective dose, which include factors to reflect tissue sensitivity and radiation type—so they measure potential biological impact, not the pure energy deposition. Hence, for the absorbed-dose quantity, gray is the correct SI unit.

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